GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.

Observable Notebooks - The portfolio and technical blog of Chris Henrick – provider of professional web development, data visualization, GIS, mapping, & cartography services.

Dr. Geo - Dr. Geo, a software to design & manipulate interactive geometric sketches.

Jupyter - Project Jupyter exists to develop open-source software, open-standards, and services for interactive computing across dozens of programming languages. Ready to get started? Try it in your browser Install the Notebook.

Giac/Xcas - Free computer algebra system

BeakerX - Open Source Polyglot Data Science Tool